Second developer here.
Yea we are aware of quite a few small bugs we didnt fix in time. We prioritised fixing all the game breaking bugs, and some of the bugs were first fixed up to 30 minutes before deadline which lead to some bugs we could not fix in time. The score is simply because we forgot to reset it upon restart. To fix this you can hit space to fully restart the game, which will reset your score aswell.
Glad you like, we will most likely update the version when the jam voting is over to fix the bugs and maybe add a few more features.